Reduction transmission



W. S. JENNINGS REDUCTION TRANSMISSION Filed Jan. 14, 1924 2 sheets-sheer 1 *v ...Hm- L Sepa. 1e. 1924. W. S. JENNINGS REDUCTION TRANSMISSION Filed Jan. 14 1924 2 Sheets-Sheet 2 Patented Sept. 16, 1924e ,ii/'INFIELD SCOTT JENNINGS, or ANTIGO, WISCONSIN.

REDUCTION TRANSMISSION.

lApplication led January 14, 1924:. SeriaINO. 686,129.

T o all'ivhom itmayconc'm:

Be it known thatI, vlNINFIELD SCOTT IEN` srfiNos, a citizen ofthe United States, and :resident of Antigo, in the county of Lang` `lade'and State of Visconsin, have invented 'certain new and useful Improvements in Reduction Transmissions; and I do hereby declare'th'at the ollowingis a full, cleanand exact description thereof.

rIhis invention relates'toreduction transmissions.

'reduction transmission 4whi'chsecures la great reduction with a small number :of gears,

'which .is 'ivery -`compact, which isrselfeconand of substantial construction.

An'embodimentrof'the invention is shownv in the accompanyingdrawings, in which :Figure lisa sectional elevation through the transmission. l

F1gure 2 1s a fragmentary' sectional view i on the lin'e 2-'2 of Figure 1.

Figure 3 is a corresponding view on the line 3 3 of Figure l.

. The vtransmiss1on comprises a driving shaft lupon which all of the parts are car-A lried. y'Ihisdriving sha'ftilxas loosely mountedthereon au'relatively large internal gear 2 provided vwitha 'cylindrical outer portion Y 'Sfand'w'ithva disk-like face 4.' This `face is provided with an inwardly 'opening `annular groove Sand-with asmaller annular groove f6 which Vopens into 'the groove 5. A'second internall'gear 7 which may be vsmaller lthan 'the gear 2 is provided yand 'arranged in abutting contact with the corresponding face of 'thefgear 2. It is tov be noted in this connec- Ntion that each of the gear structures comprises a cup-like section which, together, form a complete housing for the apparatus. The gear 7 is provided with an outer cylindrica'l rface 8 and it is lto be noted that'the Algeiar"therein "does 'not 'extend completely ther, but that a space 29 is provided within "this v.shell-like member.

across :the'insi'de of the last discussed'mem- The gear 7 ispro- Vvided 'with afdisk Vface A10 within which an "annular'ggroove V:11 'is formed. A l plurality of ylindricalfhioles 12Ja're"p'rovi`ded at regullarintervals'inthe disk-like portion 10 and "open into V'thefgroove 11. If desired, the `fgrooves 5 and '11' of vthe two ymain cup- V`shaped 'gear membersl may beformed in outwardly projecting portions, and` it is to vhe notedthat these v'outwardly projecting "operating clutch teeth 27.

portions may be formed with flanges 13 and 14C, respectively, and with pulley faces 15 and 16. These pulleys receive the driven belts 17 and 18, respectively, although it is tof be Vunderstood'that vother means Aof transmitting power o from the lcup-shaped geai vInembers may beemployed A 'pinion 19 is keyed to the shaft 1v and mounted inside oit' the casing `formed by the cup-shaped 'internal gearmembers.

yThis pinion meshes with a second pinion 2O which in turn meshes with the internal gear 2. This' -p1n1on`20 1s carried by a trans- -verse pin 21 and is loose thereon. 'p This pin r is slidably carried'by rings 22 'and 23' which slidably 'tit the annul'argrooves '5 and l11.'

vIt is tofbenoted that the groove 6 is ofsuicient size to freelyreceive the pin 21 and permit it to travel around` suoli groove under certain conditions, andthat the'cylindrii call apertures v12fare adapted to'receive and form seats for the other end of such' pin under other conditions.

engagement with either the groove 6 or lthe holes 12. This'pinion 20'is provided withv clutch teeth 24: on its inner sidev 'and a Second pinion 25,'pinned to the Vshaft 21,'as indicated at 26, is similarly provided with co- A n In the position ofthe parts vshown in F igure-1, theQpin is out'jof Means 'are provided for shifting the pin` of levers each of which isl provided withupper arms 33 which engage the `trunni'ons 30 and with lower armsS` which `engage 'corresponding Ytrunnions 35 `formed upon a collar 36 concentric with the shaft-1.:V This c`ollar'36 is slidably carried `within an annular'groove provided in the collar 37. "The collar 37 vis mounted vupon 'an'inward' eXtension ofthe housing 38 offthe left hand'gear member 7 `(See Figure l). The'hub B8 iseX- tended outwardly and carries' `a corresponding groove lcollar 39. The collars 37` and -39 are connected by'a plurality of rods 40 which pass through the disk-like face 10 of the leftihand gear. shell, thus whenthe 'collar'.39

in. Figuresl and 2. Thispin carries a pair is shifted by any suitable means, the collar 37 is correspondingly shifted and the levers rocked so as to move the pinion 25 and the shaft 21 as desired.

Any suitable means may be provided for holding either of the internal gears still under certain conditions of operation. For example, brake bands 41 and 42 may be pro-- vided and may be manipulated in any de sired manner.

The operation of the apparatus is as follows Assuming that the shaft 1 is driving and that the parts are in the position shown in the figures then obviously the pinion 2O will walk around the internal gear 2 carrying the shaft 21 with it and the gear 25 will freely rotate the shaft 21 without imparting motion to the other gear 7. This is a neutral position of the apparatus. However, when it is desired to secure a slow speed of the gear 7, the brake 42 is released and the brake 41 tightened,it being understood that the terms brakes are employed in a very general sense. The gear 25 is shifted by means of the mechanism controlled from the co-llar 39 and is moved to the right in Figure 1 causing its clutch teeth 27 to lock with the clutch teeth 24 and form in effect an integral union mechanically between the pinion 2O andthe pinion 25. As the shaft 1 rotates it will cause the pinion 20 to walk around the internal gear 2 and to carry and rotate the gear 25 with it. It will be noted that the ratio between the diameter of the internal gear 2 and pinion 2O is different from the ratio between the internal dia-meter of the gear 7 and the'diameter of the pinion 25. Therefore, as the number of turns of the pinion 25 is the same as that of the pinion 20, it is obvious that the gear 7 will be shifted with relation to the gear 2, and thus a slow motion will be imparted to the gear 7 when the gear 2 is held stationary. Tt is to be noted that the right hand end of the shaft 21 freely slides in the groove 6.

A second speed may be imparted to the gear 7 by shifting the pinion 25 and the shaft 21 to the eXtreme left-hand position while maintaining the gear 2 stationary. Under these conditions the shaft 21 fits within one of the holes 12 and bodily carries the gear 7 around with it as the pinion 20 is walked around the internal gear 2.

Another method of operation is to shift the pinion 25 into engagement with the pinion 20, to tighten the brake band 42, and to release the brake band 41. Under these conditions the gear 7 is held stationary while the gear 2 is allowed to move. Thus when the shaft 1 is rotated, the pinion 20 rotates and causes the pinion 25 to walk around the internal gear 7. This causes a corresponding rotation of the gear 2O about the shaft 1 as an axis and causes a slow motion to be imparted to the gear 2 in a reverse direction to necesa@ that originally imparted to the gear 7, as previously described.

A second speed may be given to the gear 2 by maintaining the internal gear 7 stationary and by shifting the pinion 25 and shaft 2l to their extreme left hand position thus seating the shaft 21 in one of the holes 12. Under these conditions the shaft 21 is stationary and consequently the pinion 20 merely acts as an idler between the pinion 19 and the internal gear 2.

lt will be seen, therefore, that a reduction transmission has been provided in which a very large reduction can be most readily accomplished with a small number of gears and by a very simple construction.

It will further be seen that a number of different speeds of the severa-l parts may be secured and also that although the driving shaft may be rotated, the driven members, that is to say, the internal gears 2 and 7 may remain stationary when the parts are in neutral position.

It is further to be noted that the parts are completely and adequately housed by the construction illustrated, and may be most readily maintained in a suitable oiled condition due to this effective housing.

Although the invention has been described in considerable detail, it is to be understood that the invention may be variously embodied and is, therefore, to be limited only as claimed.

T claim:

1. A reduction transmission comprising a driving shaft, a pair of internal gears carried thereby, a pinion keyed to said driving shaft, and a pair of pinions carried by a shaft having its airis paralleling the driving shaft, said pinions being adapted for mutual inter-locking engagement, one of said pinions meshingI with one of said internal gears and with the pinion carried by said driving shaft, the other of said pinions meshing with the other of said internal gears, means for holding either of said internal gears temporarily stationary, and means for moving` said mutually engageable pinions into and out of inter-locking engagement.

2. A reduction transmission comprising a driving shaft, a pair of cup-shaped ca -sings loosely mounted thereon and havin internal gears, a driving pinion keyed to said shaft, a second shaft freely carried by said casings, a pair of pinions mounted upon such freely movable shaft. one of said pinions meshing with said driving pinion and with one of said internal gears, the other of said pinions meshing with a second internal gear and rigidly secured to said freely movable shaft and adapted to be slid into and out of engagement with said second mentioned pinion, the casing for said second mentioned internal gear being provided with a plurality of holes, and means for shifting said freely movable shaft and said last mentioned pinion laterally whereby said second mentioned shaft may be seated in one of said holes when said last mentioned pinion is disengaged from said second mentioned pinion.

3. A reduction transmission comprising a driving shaft, a pair of Cup-shaped oasings loosely mounted thereon and having internal gears, a driving pinion keyed to said shaft, a second shaft freely carried by said oasings, apair of pinions mounted upon said freely movable shaft, one of said pinions meshing With said driving pinion and With engagement with said second mentioned pinion, the easing for said second mentioned internal gear being provided with a plurality of holes, and means for holding either of said oasings temporarily stationary.

In testimony that I claim the foregoing I have hereunto set myl hand at Antigo, in the County of Langlade and State of Wisconsin.

WINFIELD SCOTT JENNINGS. 

